/Engine/Plugins/Experimental/Mutable/Source/CustomizableObjectEditor/Public/MuCOE/CustomizableObjectEditorViewportClient.h
Set the material index whose UVs will be drawn.
void SetDrawUVOverlayMaterial ( const [FString](API\Runtime\Core\Containers\FString) & MaterialName, [FString](API\Runtime\Core\Containers\FString) UVChannel )